Unit Testing in Android
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Unit testing in Android involves testing individual units or components of an Android application to verify their correctness. This is done during development by the developer. The document discusses what unit testing involves, provides examples of unit tests for a number validator class and interval overlapping detector class, and discusses test doubles, constraints of unit testing in Android, where to unit test in an Android app, and test-driven development.
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Unit Testing in Android
- 1. Unit Testing in Android By Shamsul Arafin Mahtab Software Engineer, M2SYS Technology Presentation Slide
- 2. What Should we know at first 2 ➢ A type of software testing where individual units/ components of a software are tested ➢ Done during the development (coding) of an application ➢ The objective of Unit Testing is to verify its correctness ➢ Usually performed by the developer ➢ Tools that we use in Android: JUnit4
- 3. What is Unit Testing’s Job 3 Ensuring that ‘the thing’ does what it is supposed to do
- 4. Code Structure in Android 4 import org.junit.After; import org.junit.Before; import org.junit.Test; public class NumberValidatorTest { /** SystemUnderTest */ NumberValidator SUT; @Before public void setUp() throws Exception { SUT = new NumberValidator(); } /** Naming unitOfWork_stateUnderTest_expectedBehaviour */ @Test public void checkPositive_correct_trueReturned() { } @After public void tearDown() throws Exception { } } Press Ctrl+Shift+T for a new Test class.
- 5. Example 1 5
- 6. Example 1 – Number Validator 6 public class NumberValidatorTest { NumberValidator SUT; @Before public void setUp() throws Exception { SUT = new NumberValidator(); } @Test public void checkPositive_positive_trueReturned() { boolean result = SUT.isPositiveNumber(2); Assert.assertThat(result, CoreMatchers.is(true)); } @Test public void checkPositive_zero_falseReturned() { boolean result = SUT.isPositiveNumber(0); Assert.assertThat(result, CoreMatchers.is(false)); } @Test public void checkPositive_negative_falseReturned() { boolean result = SUT.isPositiveNumber(-1); Assert.assertThat(result, CoreMatchers.is(false)); } }
- 7. Example 1 – Test Output 7 Current Implementation
- 8. Example 2 – Boundary Check 8
- 9. Example 2 – Overlapping Detector 9 Test Cases 1. Interval1 before Interval2 (False) 2. Interval1 overlaps Interval2 on start (True) 3. Interval1 contained on Interval2 (True) 4. Interval1 contains Interval2 (True) 5. Interval1 overlaps Interval2 on end (True) 6. Interval1 after Interval2 (False) 7. Interval1 adjacent to Interval2 on start (True) 8. Interval1 adjacent to Interval2 on end (True)
- 10. Example 2 – Overlapping Detector 10 Run IntervalsOverlapDetectorTest with Coverage Coverage Result
- 11. Introduction To Test Doubles 11
- 12. Why Test Double man!! 12 But if you have dependencies…..
- 13. Test Double Summary 13 ➢ Used to substitute external unit dependencies in tests ➢ Three types of Test Doubles: Fake, Stub, Mock ➢ Fake: Functional implementation optimized for test ➢ Stub: Returns predefined data and can have programmable behavior ➢ Mock: Records interactions with itself ➢ Mock is most used
- 14. List of Test Frameworks 14 Language Test Frameworks Mocking Frameworks Java JUnit Mockito Kotlin Spek, KotlinTest Mockito-Kotlin, MockK
- 15. Some Constraints 15 ➢ Unit Test is not aware of Nullability ➢ Don’t use Singleton ➢ Static Methods has hidden dependencies, so can not be substituted ➢ Can’t test on Android Frameworks
- 16. Where can we unit test in our app 16 UI Layer Application Layer Domain Layer Infrastructure Layer Espresso Test
- 17. Black Box v White Box testing 17 Black Box Testing White Box Testing
- 18. Which one is better? 18
- 19. Test Driven Development to Rescue? 19
- 20. Uncle Bob’s Technique 20 1. You are not allowed to write any production code unless it is to make a failing unit test pass 2. You are not allowed to write any more of a unit test than is sufficient to fail and compilation failures are failures 3. You are not allowed to write any more production code than it is sufficient to pass the one failing unit test
- 21. Your Decision 21 Be honest, do you like it to do when you will implement?
- 22. My Decision after the study 22
- 23. Thank You 23
Editor's Notes
- #3: Here we can see a Popular News Paper of Bangladesh. To properly target NLP in Bengali we think to target on a specific domain such as Bangladesh topic, International topics, Politics, Economics, Sports, Entertainment, Education etc. That’s why we have target on Cricket to cover up the sports domain in Bengali Natural Language Processing.
- #4: Here we can see a Popular News Paper of Bangladesh. To properly target NLP in Bengali we think to target on a specific domain such as Bangladesh topic, International topics, Politics, Economics, Sports, Entertainment, Education etc. That’s why we have target on Cricket to cover up the sports domain in Bengali Natural Language Processing.
- #23: CNN is a class of deep, feed-forward artificial neural networks ( where connections between nodes do not form a cycle) & use a variation of multilayer perceptrons designed to require minimal preprocessing. These are inspired by animal visual cortex.